The CAS Registry Mumber 51787-41-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,7,8 and 7 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 51787-41: (7*5)+(6*1)+(5*7)+(4*8)+(3*7)+(2*4)+(1*1)=138 138 % 10 = 8 So 51787-41-8 is a valid CAS Registry Number.
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